Mechanical properties of 3D printed denture base polymers

Coldea, Andrea ; Mayinger, Felicitas ; Meinen, John; Hoffmann, Moritz und Stawarczyk, Bogna (Mai 2025): Mechanical properties of 3D printed denture base polymers. In: Journal of Prosthetic Dentistry, Bd. 133, Nr. 5, 1361.e1-1361.e8

Abstract

Statement of problem

Studies on the mechanical properties of 3-dimensionally (3D) printed denture base polymers with appropriate test methods are lacking.

Purpose

The purpose of this in vitro study was to determine the flexural strength (σf), elastic modulus (E), fracture toughness (KIC), work of fracture (ωe), and Martens hardness (HM) of 3D printed denture base polymers and to compare them with an injection molded material.

Material and methods

Three resins for additive (Lucitone Digital Print, LDP; Flexcera Base, FCB and an experimental material, EXP) and 1 for injection molding (IvoBase Hybrid, IBH) fabrication were analyzed. Standardized specimens were fabricated, polished, tempered, and thermal cycled (5 °C to 55 °C) before testing for σf, E, KIC, ωe, and HM. The results were explored by global analysis (α=.05). The Kolmogorov-Smirnov test was used to test for data distribution. Parametric and nonparametric tests followed by pairwise comparison were applied to test for differences between groups.

Results

The σf, E, and HM of 3D printed polymers were significantly lower than those of the injection molded, both for the tempered and aged groups. The σf was lowest for FCB and highest for IBH in the tempered state. The KIC and ωe of the tempered EXP and IBH groups were lower compared with those of FCB and LDP. After aging, EXP, FCB, and IBH presented KIC in the same range, but it was lower than for LDP. Compared with the printable polymers, the control group IBH was not affected by artificial aging.

Conclusions

The σf, E, and HM of printable polymers were lower than those of the control group, and specimens did not fracture in bend testing. In contrast, KIC and ωe were the highest for a printable polymer. Therefore, tension tests should be considered when testing ductile materials.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin > Klinikum der LMU München > Poliklinik für Zahnärztliche Prothetik
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0022-3913
• Sprache: Englisch